Hand loom



March 11, 1952 J- C. IWALD HAND LOOM Filed June 17, 1949 FIG] FIG?

Snnentor JoHAM C. IWALD Gttomeg Patented Mar. 11, 1952 HAND LOOM Johan Carl Iwald, Rorosjon, Sweden Application June 17, 1949, Serial No. 99,827 In Sweden April 25, 1947 3 Claims. (01. 139-29) My invention relates to hand looms, and the object of the invention is to provide mechanism involving certain advantages the nature of which will appear from the following description in connection with the annexed drawing wherein Fig. 1 illustrates a side elevation of part of a loom with my improved machanism, and Fig. 2 is a fragmentary end elevation looking from the left in Fig. 1.

In the drawing, numeral Ill indicates one of the two side frames of the loom. Numeral II denotes the slay beam having the reed l5. At both ends, the slay beam II is connected to two bars l2, l2a which at their other ends are interconnected by pivot indicated at 16a. Each pivot [5a engages the crank 13 of a rod which extends crosswise between the two side frames III. A link 14 is pivoted at the lower end I 1 to the lower bar 12a and pivoted at the upper end I8 to a portion of the side frame 10. Numeral l9 indicates diagrammatically the upper portion of the shaft motion mechanism.

In operation, the slay beam ll together with the bars l2, 12a constitutes a reciprocating unit which is moved between the positions indicated in full line and dotted lines, the members [3 and I4 performing swinging movements about their upper fulcrums. With a certain ratio 'between the lengths of the crank l3 and link I4, and if the pivot I1 is located at a certain point of the lower bar [2a, the beam H will be moved along a straight horizontal path, and the reed 15 will be located at right angles to the warp when the weft is about to be beaten up. The abovenamed ratio can be easily determined mathematically. For instance, if the pivot I Tis located exactly midway between the rod l6 and the beam at the end of the lower bar [2a, the length of the crank l3 should be half the length of the link I 4, in order to secure straight movement of the slay beam.

It will be understood that a similar mechanism is arranged at the other ide frame.

From above description it will be apparent that, as a result of the provision of the members l3 and I4, proper movement of the slay beam is secured in spite of the very short length of the links I4.

What I claim is:

1. In a hand loom, two side frames, a reciprocating unit including a slay beam and substantially horizontal bars fixed at one of their ends to said beam, crank-like members pivotally mounted near the other ends of said bars, and pivotally mounted in said side frames above the plane of said horizontal bars, and suspending links for said unit, each link being at its lower end pivotally secured to one of said bars at a point between aid beam and said member and being at its upper end pivotally secured to one of said side frames.

2. In a hand loom, two side frames, a reciprocating unit including a slay beam and substantially horizontal bars fixed at one of their ends to said beam, crank-like members pivotally mounted near the other ends of said bars, and pivotally mounted in said side frames above the plane of said horizontal bars, and suspending links for said unit, each link being at'its lower end pivotally secured to one of said bars at a point between said beam and said member and being at its upper end pivotally secured to one of said side frames, the ratio between the length of aid crank-like members and said links and the location of said point being such as to have said beam move along a straight horizontal path.

3. In a hand loom, two side frames, a reciprocating unit including a slay beam and substantially horizontal bars fixed at one of their ends to said beam, crank-like members pivotally mounted near the other ends of said bars, and pivotally mounted in said side frames above the plane of said horizontal bars, and suspending links for said unit, each link being at its lower end pivotally secured to one of said bars midway between said beam and said member and being at its upper end pivotally secured to one of said side frames, the length of each of aid cranklike members being half the length of each of said links.

JOHAN CARL IWALD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 234,761 Fish Nov. 23, 1880 1,540,574 Steber June 2, 1925 1,636,551 Bunnell et al July 19, 1927 2,147,483 Churchill Feb. 14, 1939 FOREIGN PATENTS Number Country Date 510,689 Germany Oct. 22, 1930 

